Preheat oven to 180C. Grease and line 900mL loaf pan. Sift flour, baking powder, cinnamon and sugar with 1 tsp salt. In a separate bowl, combine oil, egg and vanilla. Add to the dry ingredients with bananas and nuts and fold until just combined – do not over mix. Place into loaf pan and cook for 50 mins. Leave in tin for 10mins before turning out.